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Ground-Based Observatories Engineering Peer Review: Field Site Deployment/Operations

This document outlines communication tests, data rates, and site deployments for ground-based observatories. It discusses the Fort Smith, Prince George, and Lac de Gras sites, as well as hazards in these locations. The document also covers telemetry, data streams, and packet protocols used in the observatories.

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Ground-Based Observatories Engineering Peer Review: Field Site Deployment/Operations

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  1. Ground Based Observatories (GBO)Engineering Peer ReviewOct. 17, 2003Field Site Deployment/OperationsMike Greffen and Brian JackelUniversity of Calgary

  2. Outline • Communication • tests • data rates • Sites • Fort Smith • Prince George • Lac de Gras • Northern hazards

  3. Lac de Gras Whitehorse Fort Simpson Fort Simpson Fort Smith Fort Smith Athabasca Prince George Edmonton Calgary “Near-by” site locations Calgary – Fort Smith: 1600 km, gravel road for last 70km.

  4. Fort Smith test • HSi system installation on October 29, Mike Greffen and Brian Jackel will be present for testing • existing CANOPUS site • “tee” data stream from mags, riometer, scanning photometer (no ASI) • on-site logging • real-time link to Calgary and Edmonton

  5. Telesat HSi coverage

  6. Telesat HSi UDP packets RFC768: “This protocol provides a procedure for application programs to send messages to other programs with a minimum of protocol mechanism. The protocol is transaction oriented, and delivery and duplicate protection are not guaranteed. Applications requiring ordered reliable delivery of streams of data should use the Transmission Control Protocol (TCP).”

  7. Telesat HSi TCP packets RFC793: “TCP is a connection-oriented, end-to-end reliable protocol designed to fit into a layered hierarchy of protocols which support multi-network applications. ... Very few assumptions are made as to the reliability of the communication protocols below the TCP layer. TCP assumes it can obtain a simple, potentially unreliable datagram service from the lower level protocols. In principle, the TCP should be able to operate above a wide spectrum of communication systems ranging from hard-wired connections to packet-switched or circuit-switched networks.”

  8. Imager data rates • Raw image frames: 256x256 16-bit values. PNG compression reduces this to 90 kbytes/frame (70%). A 5-second frame rate will produce 150 kbps or 60 Mbytes/hour. • Thumbnail frames: 20x20 8-bit values plus header information (roughly 50 bytes). GZIP compression reduces this to 270 bytes/frame (60%). A 5-second frame rate will produce 430 bps or 190 kbytes/hour. • System status: currently logging approx. 10 kbytes every 5 minutes, or 100 kbytes/hour. Essential information is much lower, roughly 10 kbytes/hour or 20 bps.

  9. Prince George (UNBC) site • University of Northern British Columbia (UNBC) at Prince George • easy access • direct internet connection • good local support • moderate light pollution • not suitable for mags • Good “dry run”, starting place to identify better sites

  10. Prince George enclosure

  11. Lac de Gras site

  12. Site List

  13. Cold and dark

  14. Deployment hazards • weather • site access uncertain • permafrost • dome ice • cables/connectors • local residents • vandalism • firearms • snowmobiles • wildlife • polar bears • cable eating critters • itchy caribou

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